42000842021 has 8 divisors (see below), whose sum is σ = 43451249688. Its totient is φ = 40570720000.

The previous prime is 42000841979. The next prime is 42000842077. The reversal of 42000842021 is 12024800024.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 315453121 + 41685388900 = 17761^2 + 204170^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42000842021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42000844021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5067200 + ... + 5075481.

It is an arithmetic number, because the mean of its divisors is an integer number (5431406211).

Almost surely, 2^42000842021 is an apocalyptic number.

42000842021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42000842021 is a deficient number, since it is larger than the sum of its proper divisors (1450407667).

42000842021 is a wasteful number, since it uses less digits than its factorization.

42000842021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10142823.

The product of its (nonzero) digits is 1024, while the sum is 23.

The spelling of 42000842021 in words is "forty-two billion, eight hundred forty-two thousand, twenty-one".